1 /** $MirOS: src/sys/net/ppp-deflate.c,v 1.3 2005/12/06 01:24:49 tg Exp $ */
2 /* $OpenBSD: ppp-deflate.c,v 1.7 2002/09/13 00:12:07 deraadt Exp $ */
3 /* $NetBSD: ppp-deflate.c,v 1.1 1996/03/15 02:28:09 paulus Exp $ */
4
5 /*
6 * ppp_deflate.c - interface the zlib procedures for Deflate compression
7 * and decompression (as used by gzip) to the PPP code.
8 * This version is for use with mbufs on BSD-derived systems.
9 *
10 * Copyright (c) 1989-2002 Paul Mackerras. All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the
22 * distribution.
23 *
24 * 3. The name(s) of the authors of this software must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission.
27 *
28 * 4. Redistributions of any form whatsoever must retain the following
29 * acknowledgment:
30 * "This product includes software developed by Paul Mackerras
31 * <paulus@samba.org>".
32 *
33 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
34 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
35 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
36 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
37 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
38 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
39 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
40 */
41
42 #include <sys/param.h>
43 #include <sys/types.h>
44 #include <sys/systm.h>
45 #include <sys/mbuf.h>
46 #include <net/ppp_defs.h>
47 #define _BSD_STANDXX
48 #include <zlib.h>
49
50 #define PACKETPTR struct mbuf *
51 #include <net/ppp-comp.h>
52
53 #if DO_DEFLATE
54
55 /*
56 * State for a Deflate (de)compressor.
57 */
58 struct deflate_state {
59 int seqno;
60 int w_size;
61 int unit;
62 int hdrlen;
63 int mru;
64 int debug;
65 z_stream strm;
66 struct compstat stats;
67 };
68
69 #define DEFLATE_OVHD 2 /* Deflate overhead/packet */
70
71 static void *zalloc(void *, u_int items, u_int size);
72 static void zfree(void *, void *ptr);
73 static void *z_comp_alloc(u_char *options, int opt_len);
74 static void *z_decomp_alloc(u_char *options, int opt_len);
75 static void z_comp_free(void *state);
76 static void z_decomp_free(void *state);
77 static int z_comp_init(void *state, u_char *options, int opt_len,
78 int unit, int hdrlen, int debug);
79 static int z_decomp_init(void *state, u_char *options, int opt_len,
80 int unit, int hdrlen, int mru, int debug);
81 static int z_compress(void *state, struct mbuf **mret,
82 struct mbuf *mp, int slen, int maxolen);
83 static void z_incomp(void *state, struct mbuf *dmsg);
84 static int z_decompress(void *state, struct mbuf *cmp,
85 struct mbuf **dmpp);
86 static void z_comp_reset(void *state);
87 static void z_decomp_reset(void *state);
88 static void z_comp_stats(void *state, struct compstat *stats);
89
90 /*
91 * Procedures exported to if_ppp.c.
92 */
93 struct compressor ppp_deflate = {
94 CI_DEFLATE, /* compress_proto */
95 z_comp_alloc, /* comp_alloc */
96 z_comp_free, /* comp_free */
97 z_comp_init, /* comp_init */
98 z_comp_reset, /* comp_reset */
99 z_compress, /* compress */
100 z_comp_stats, /* comp_stat */
101 z_decomp_alloc, /* decomp_alloc */
102 z_decomp_free, /* decomp_free */
103 z_decomp_init, /* decomp_init */
104 z_decomp_reset, /* decomp_reset */
105 z_decompress, /* decompress */
106 z_incomp, /* incomp */
107 z_comp_stats, /* decomp_stat */
108 };
109
110 struct compressor ppp_deflate_draft = {
111 CI_DEFLATE_DRAFT, /* compress_proto */
112 z_comp_alloc, /* comp_alloc */
113 z_comp_free, /* comp_free */
114 z_comp_init, /* comp_init */
115 z_comp_reset, /* comp_reset */
116 z_compress, /* compress */
117 z_comp_stats, /* comp_stat */
118 z_decomp_alloc, /* decomp_alloc */
119 z_decomp_free, /* decomp_free */
120 z_decomp_init, /* decomp_init */
121 z_decomp_reset, /* decomp_reset */
122 z_decompress, /* decompress */
123 z_incomp, /* incomp */
124 z_comp_stats, /* decomp_stat */
125 };
126 /*
127 * Space allocation and freeing routines for use by zlib routines.
128 */
129 void *
zalloc(notused,items,size)130 zalloc(notused, items, size)
131 void *notused;
132 u_int items, size;
133 {
134 void *ptr;
135
136 MALLOC(ptr, void *, items * size, M_DEVBUF, M_NOWAIT);
137 return ptr;
138 }
139
140 void
zfree(notused,ptr)141 zfree(notused, ptr)
142 void *notused;
143 void *ptr;
144 {
145 FREE(ptr, M_DEVBUF);
146 }
147
148 /*
149 * Allocate space for a compressor.
150 */
151 static void *
z_comp_alloc(options,opt_len)152 z_comp_alloc(options, opt_len)
153 u_char *options;
154 int opt_len;
155 {
156 struct deflate_state *state;
157 int w_size;
158
159 if (opt_len != CILEN_DEFLATE
160 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
161 || options[1] != CILEN_DEFLATE
162 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
163 || options[3] != DEFLATE_CHK_SEQUENCE)
164 return NULL;
165 w_size = DEFLATE_SIZE(options[2]);
166 if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
167 return NULL;
168
169 MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
170 M_DEVBUF, M_NOWAIT);
171 if (state == NULL)
172 return NULL;
173
174 state->strm.next_in = NULL;
175 state->strm.zalloc = zalloc;
176 state->strm.zfree = zfree;
177 if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL,
178 -w_size, 8, Z_DEFAULT_STRATEGY, DEFLATE_OVHD+2) != Z_OK) {
179 FREE(state, M_DEVBUF);
180 return NULL;
181 }
182
183 state->w_size = w_size;
184 bzero(&state->stats, sizeof(state->stats));
185 return (void *) state;
186 }
187
188 static void
z_comp_free(arg)189 z_comp_free(arg)
190 void *arg;
191 {
192 struct deflate_state *state = (struct deflate_state *) arg;
193
194 deflateEnd(&state->strm);
195 FREE(state, M_DEVBUF);
196 }
197
198 static int
z_comp_init(arg,options,opt_len,unit,hdrlen,debug)199 z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
200 void *arg;
201 u_char *options;
202 int opt_len, unit, hdrlen, debug;
203 {
204 struct deflate_state *state = (struct deflate_state *) arg;
205
206 if (opt_len < CILEN_DEFLATE
207 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
208 || options[1] != CILEN_DEFLATE
209 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
210 || DEFLATE_SIZE(options[2]) != state->w_size
211 || options[3] != DEFLATE_CHK_SEQUENCE)
212 return 0;
213
214 state->seqno = 0;
215 state->unit = unit;
216 state->hdrlen = hdrlen;
217 state->debug = debug;
218
219 deflateReset(&state->strm);
220
221 return 1;
222 }
223
224 static void
z_comp_reset(arg)225 z_comp_reset(arg)
226 void *arg;
227 {
228 struct deflate_state *state = (struct deflate_state *) arg;
229
230 state->seqno = 0;
231 deflateReset(&state->strm);
232 }
233
234 int
z_compress(arg,mret,mp,orig_len,maxolen)235 z_compress(arg, mret, mp, orig_len, maxolen)
236 void *arg;
237 struct mbuf **mret; /* compressed packet (out) */
238 struct mbuf *mp; /* uncompressed packet (in) */
239 int orig_len, maxolen;
240 {
241 struct deflate_state *state = (struct deflate_state *) arg;
242 u_char *rptr, *wptr;
243 int proto, olen, wspace, r, flush;
244 struct mbuf *m;
245
246 /*
247 * Check that the protocol is in the range we handle.
248 */
249 rptr = mtod(mp, u_char *);
250 proto = PPP_PROTOCOL(rptr);
251 if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) {
252 *mret = NULL;
253 return orig_len;
254 }
255
256 /* Allocate one mbuf initially. */
257 if (maxolen > orig_len)
258 maxolen = orig_len;
259 MGET(m, M_DONTWAIT, MT_DATA);
260 *mret = m;
261 if (m != NULL) {
262 m->m_len = 0;
263 if (maxolen + state->hdrlen > MLEN)
264 MCLGET(m, M_DONTWAIT);
265 wspace = M_TRAILINGSPACE(m);
266 if (state->hdrlen + PPP_HDRLEN + 2 < wspace) {
267 m->m_data += state->hdrlen;
268 wspace -= state->hdrlen;
269 }
270 wptr = mtod(m, u_char *);
271
272 /*
273 * Copy over the PPP header and store the 2-byte sequence number.
274 */
275 wptr[0] = PPP_ADDRESS(rptr);
276 wptr[1] = PPP_CONTROL(rptr);
277 wptr[2] = PPP_COMP >> 8;
278 wptr[3] = PPP_COMP;
279 wptr += PPP_HDRLEN;
280 wptr[0] = state->seqno >> 8;
281 wptr[1] = state->seqno;
282 wptr += 2;
283 state->strm.next_out = wptr;
284 state->strm.avail_out = wspace - (PPP_HDRLEN + 2);
285 } else {
286 state->strm.next_out = NULL;
287 state->strm.avail_out = 1000000;
288 wptr = NULL;
289 wspace = 0;
290 }
291 ++state->seqno;
292
293 rptr += (proto > 0xff)? 2: 3; /* skip 1st proto byte if 0 */
294 state->strm.next_in = rptr;
295 state->strm.avail_in = mtod(mp, u_char *) + mp->m_len - rptr;
296 mp = mp->m_next;
297 flush = (mp == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
298 olen = 0;
299 for (;;) {
300 r = deflate(&state->strm, flush);
301 if (r != Z_OK) {
302 printf("z_compress: deflate returned %d (%s)\n",
303 r, (state->strm.msg? state->strm.msg: ""));
304 break;
305 }
306 if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
307 break; /* all done */
308 if (state->strm.avail_in == 0 && mp != NULL) {
309 state->strm.next_in = mtod(mp, u_char *);
310 state->strm.avail_in = mp->m_len;
311 mp = mp->m_next;
312 if (mp == NULL)
313 flush = Z_PACKET_FLUSH;
314 }
315 if (state->strm.avail_out == 0) {
316 if (m != NULL) {
317 m->m_len = wspace;
318 olen += wspace;
319 MGET(m->m_next, M_DONTWAIT, MT_DATA);
320 m = m->m_next;
321 if (m != NULL) {
322 m->m_len = 0;
323 if (maxolen - olen > MLEN)
324 MCLGET(m, M_DONTWAIT);
325 state->strm.next_out = mtod(m, u_char *);
326 state->strm.avail_out = wspace = M_TRAILINGSPACE(m);
327 }
328 }
329 if (m == NULL) {
330 state->strm.next_out = NULL;
331 state->strm.avail_out = 1000000;
332 }
333 }
334 }
335 if (m != NULL)
336 olen += (m->m_len = wspace - state->strm.avail_out);
337
338 /*
339 * See if we managed to reduce the size of the packet.
340 * If the compressor just gave us a single zero byte, it means
341 * the packet was incompressible.
342 */
343 if (m != NULL && olen < orig_len
344 && !(olen == PPP_HDRLEN + 3 && *wptr == 0)) {
345 state->stats.comp_bytes += olen;
346 state->stats.comp_packets++;
347 } else {
348 if (*mret != NULL) {
349 m_freem(*mret);
350 *mret = NULL;
351 }
352 state->stats.inc_bytes += orig_len;
353 state->stats.inc_packets++;
354 olen = orig_len;
355 }
356 state->stats.unc_bytes += orig_len;
357 state->stats.unc_packets++;
358
359 return olen;
360 }
361
362 static void
z_comp_stats(arg,stats)363 z_comp_stats(arg, stats)
364 void *arg;
365 struct compstat *stats;
366 {
367 struct deflate_state *state = (struct deflate_state *) arg;
368 u_int out;
369
370 *stats = state->stats;
371 stats->ratio = stats->unc_bytes;
372 out = stats->comp_bytes + stats->inc_bytes;
373 if (stats->ratio <= 0x7ffffff)
374 stats->ratio <<= 8;
375 else
376 out >>= 8;
377 if (out != 0)
378 stats->ratio /= out;
379 }
380
381 /*
382 * Allocate space for a decompressor.
383 */
384 static void *
z_decomp_alloc(options,opt_len)385 z_decomp_alloc(options, opt_len)
386 u_char *options;
387 int opt_len;
388 {
389 struct deflate_state *state;
390 int w_size;
391
392 if (opt_len != CILEN_DEFLATE
393 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
394 || options[1] != CILEN_DEFLATE
395 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
396 || options[3] != DEFLATE_CHK_SEQUENCE)
397 return NULL;
398 w_size = DEFLATE_SIZE(options[2]);
399 if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
400 return NULL;
401
402 MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
403 M_DEVBUF, M_NOWAIT);
404 if (state == NULL)
405 return NULL;
406
407 state->strm.next_out = NULL;
408 state->strm.zalloc = zalloc;
409 state->strm.zfree = zfree;
410 if (inflateInit2(&state->strm, -w_size) != Z_OK) {
411 FREE(state, M_DEVBUF);
412 return NULL;
413 }
414
415 state->w_size = w_size;
416 bzero(&state->stats, sizeof(state->stats));
417 return (void *) state;
418 }
419
420 static void
z_decomp_free(arg)421 z_decomp_free(arg)
422 void *arg;
423 {
424 struct deflate_state *state = (struct deflate_state *) arg;
425
426 inflateEnd(&state->strm);
427 FREE(state, M_DEVBUF);
428 }
429
430 static int
z_decomp_init(arg,options,opt_len,unit,hdrlen,mru,debug)431 z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
432 void *arg;
433 u_char *options;
434 int opt_len, unit, hdrlen, mru, debug;
435 {
436 struct deflate_state *state = (struct deflate_state *) arg;
437
438 if (opt_len < CILEN_DEFLATE
439 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
440 || options[1] != CILEN_DEFLATE
441 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
442 || DEFLATE_SIZE(options[2]) != state->w_size
443 || options[3] != DEFLATE_CHK_SEQUENCE)
444 return 0;
445
446 state->seqno = 0;
447 state->unit = unit;
448 state->hdrlen = hdrlen;
449 state->debug = debug;
450 state->mru = mru;
451
452 inflateReset(&state->strm);
453
454 return 1;
455 }
456
457 static void
z_decomp_reset(arg)458 z_decomp_reset(arg)
459 void *arg;
460 {
461 struct deflate_state *state = (struct deflate_state *) arg;
462
463 state->seqno = 0;
464 inflateReset(&state->strm);
465 }
466
467 /*
468 * Decompress a Deflate-compressed packet.
469 *
470 * Because of patent problems, we return DECOMP_ERROR for errors
471 * found by inspecting the input data and for system problems, but
472 * DECOMP_FATALERROR for any errors which could possibly be said to
473 * be being detected "after" decompression. For DECOMP_ERROR,
474 * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be
475 * infringing a patent of Motorola's if we do, so we take CCP down
476 * instead.
477 *
478 * Given that the frame has the correct sequence number and a good FCS,
479 * errors such as invalid codes in the input most likely indicate a
480 * bug, so we return DECOMP_FATALERROR for them in order to turn off
481 * compression, even though they are detected by inspecting the input.
482 */
483 int
z_decompress(arg,mi,mop)484 z_decompress(arg, mi, mop)
485 void *arg;
486 struct mbuf *mi, **mop;
487 {
488 struct deflate_state *state = (struct deflate_state *) arg;
489 struct mbuf *mo, *mo_head;
490 u_char *rptr, *wptr;
491 int rlen, olen, ospace;
492 int seq, i, flush, r, decode_proto;
493 u_char hdr[PPP_HDRLEN + DEFLATE_OVHD];
494
495 *mop = NULL;
496 rptr = mtod(mi, u_char *);
497 rlen = mi->m_len;
498 for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i) {
499 while (rlen <= 0) {
500 mi = mi->m_next;
501 if (mi == NULL)
502 return DECOMP_ERROR;
503 rptr = mtod(mi, u_char *);
504 rlen = mi->m_len;
505 }
506 hdr[i] = *rptr++;
507 --rlen;
508 }
509
510 /* Check the sequence number. */
511 seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1];
512 if (seq != state->seqno) {
513 if (state->debug)
514 printf("z_decompress%d: bad seq # %d, expected %d\n",
515 state->unit, seq, state->seqno);
516 return DECOMP_ERROR;
517 }
518 ++state->seqno;
519
520 /* Allocate an output mbuf. */
521 MGETHDR(mo, M_DONTWAIT, MT_DATA);
522 if (mo == NULL)
523 return DECOMP_ERROR;
524 mo_head = mo;
525 mo->m_len = 0;
526 mo->m_next = NULL;
527 MCLGET(mo, M_DONTWAIT);
528 ospace = M_TRAILINGSPACE(mo);
529 if (state->hdrlen + PPP_HDRLEN < ospace) {
530 mo->m_data += state->hdrlen;
531 ospace -= state->hdrlen;
532 }
533
534 /*
535 * Fill in the first part of the PPP header. The protocol field
536 * comes from the decompressed data.
537 */
538 wptr = mtod(mo, u_char *);
539 wptr[0] = PPP_ADDRESS(hdr);
540 wptr[1] = PPP_CONTROL(hdr);
541 wptr[2] = 0;
542
543 /*
544 * Set up to call inflate. We set avail_out to 1 initially so we can
545 * look at the first byte of the output and decide whether we have
546 * a 1-byte or 2-byte protocol field.
547 */
548 state->strm.next_in = rptr;
549 state->strm.avail_in = rlen;
550 mi = mi->m_next;
551 flush = (mi == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
552 rlen += PPP_HDRLEN + DEFLATE_OVHD;
553 state->strm.next_out = wptr + 3;
554 state->strm.avail_out = 1;
555 decode_proto = 1;
556 olen = PPP_HDRLEN;
557
558 /*
559 * Call inflate, supplying more input or output as needed.
560 */
561 for (;;) {
562 r = inflate(&state->strm, flush);
563 if (r != Z_OK) {
564 #ifndef DEFLATE_DEBUG
565 if (state->debug)
566 #endif
567 printf("z_decompress%d: inflate returned %d (%s)\n",
568 state->unit, r, (state->strm.msg? state->strm.msg: ""));
569 m_freem(mo_head);
570 return DECOMP_FATALERROR;
571 }
572 if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
573 break; /* all done */
574 if (state->strm.avail_in == 0 && mi != NULL) {
575 state->strm.next_in = mtod(mi, u_char *);
576 state->strm.avail_in = mi->m_len;
577 rlen += mi->m_len;
578 mi = mi->m_next;
579 if (mi == NULL)
580 flush = Z_PACKET_FLUSH;
581 }
582 if (state->strm.avail_out == 0) {
583 if (decode_proto) {
584 state->strm.avail_out = ospace - PPP_HDRLEN;
585 if ((wptr[3] & 1) == 0) {
586 /* 2-byte protocol field */
587 wptr[2] = wptr[3];
588 --state->strm.next_out;
589 ++state->strm.avail_out;
590 --olen;
591 }
592 decode_proto = 0;
593 } else {
594 mo->m_len = ospace;
595 olen += ospace;
596 MGET(mo->m_next, M_DONTWAIT, MT_DATA);
597 mo = mo->m_next;
598 if (mo == NULL) {
599 m_freem(mo_head);
600 return DECOMP_ERROR;
601 }
602 MCLGET(mo, M_DONTWAIT);
603 state->strm.next_out = mtod(mo, u_char *);
604 state->strm.avail_out = ospace = M_TRAILINGSPACE(mo);
605 }
606 }
607 }
608 if (decode_proto) {
609 m_freem(mo_head);
610 return DECOMP_ERROR;
611 }
612 olen += (mo->m_len = ospace - state->strm.avail_out);
613 #ifdef DEFLATE_DEBUG
614 if (olen > state->mru + PPP_HDRLEN)
615 printf("ppp_deflate%d: exceeded mru (%d > %d)\n",
616 state->unit, olen, state->mru + PPP_HDRLEN);
617 #endif
618
619 state->stats.unc_bytes += olen;
620 state->stats.unc_packets++;
621 state->stats.comp_bytes += rlen;
622 state->stats.comp_packets++;
623
624 *mop = mo_head;
625 return DECOMP_OK;
626 }
627
628 /*
629 * Incompressible data has arrived - add it to the history.
630 */
631 static void
z_incomp(arg,mi)632 z_incomp(arg, mi)
633 void *arg;
634 struct mbuf *mi;
635 {
636 struct deflate_state *state = (struct deflate_state *) arg;
637 u_char *rptr;
638 int rlen, proto, r;
639
640 /*
641 * Check that the protocol is one we handle.
642 */
643 rptr = mtod(mi, u_char *);
644 proto = PPP_PROTOCOL(rptr);
645 if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
646 return;
647
648 ++state->seqno;
649
650 /*
651 * Iterate through the mbufs, adding the characters in them
652 * to the decompressor's history. For the first mbuf, we start
653 * at the either the 1st or 2nd byte of the protocol field,
654 * depending on whether the protocol value is compressible.
655 */
656 rlen = mi->m_len;
657 state->strm.next_in = rptr + 3;
658 state->strm.avail_in = rlen - 3;
659 if (proto > 0xff) {
660 --state->strm.next_in;
661 ++state->strm.avail_in;
662 }
663 for (;;) {
664 r = inflateIncomp(&state->strm);
665 if (r != Z_OK) {
666 /* gak! */
667 #ifndef DEFLATE_DEBUG
668 if (state->debug)
669 #endif
670 printf("z_incomp%d: inflateIncomp returned %d (%s)\n",
671 state->unit, r, (state->strm.msg? state->strm.msg: ""));
672 return;
673 }
674 mi = mi->m_next;
675 if (mi == NULL)
676 break;
677 state->strm.next_in = mtod(mi, u_char *);
678 state->strm.avail_in = mi->m_len;
679 rlen += mi->m_len;
680 }
681
682 /*
683 * Update stats.
684 */
685 state->stats.inc_bytes += rlen;
686 state->stats.inc_packets++;
687 state->stats.unc_bytes += rlen;
688 state->stats.unc_packets++;
689 }
690
691 #endif /* DO_DEFLATE */
692